I can't make any promises about the harmonica, but I'm pretty sure the goat will have to go in the cargo hold.
Seriously, though - I've flown Delta from Manchester to Atlanta (9+ hours), though not recently (last September was the last time) but it's not as bad as I usually make it out to be!
I, too, prefer Virgin, and usually fly into New England on a Virgin flight and switch to AirTran, but sometimes you can't really beat the non-stop option. The biggest difference is really in the entertainment area - no seat-back TVs, only one movie on at a time, etc. - but otherwise the service is just fine.